59 lines
2.2 KiB
ArmAsm
59 lines
2.2 KiB
ArmAsm
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/* $NetBSD: swapcontext.S,v 1.4 2008/04/28 20:22:57 martin Exp $ */
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/*-
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Klaus Klein.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "SYS.h"
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#if defined(LIBC_SCCS) && !defined(lint)
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RCSID("$NetBSD: swapcontext.S,v 1.4 2008/04/28 20:22:57 martin Exp $")
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#endif /* LIBC_SCCS && !lint */
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.register %g2,#scratch
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ENTRY(swapcontext)
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mov %o0, %o2 /* must save pointer */
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mov %o1, %o3 /* must save pointer */
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mov SYS_getcontext, %g1
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t ST_SYSCALL
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bcc,a 1f
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stx %g0, [%o2 + 64 + 11 * 8] /* gr[_REG_O0] = 0 */
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ERROR()
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1:
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add %o7, 12, %o1
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stx %o1, [%o2 + 64 + 2 * 8] /* gr[_REG_nPC] = retaddr + 4 */
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add %o7, 8, %o1
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stx %o1, [%o2 + 64 + 1 * 8] /* gr[_REG_PC] = retaddr */
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mov %o3, %o0
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mov %o1, %g2 /* optimize `return' */
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mov SYS_setcontext|SYSCALL_G2RFLAG, %g1
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t ST_SYSCALL
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ERROR()
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